US10310230B2ActiveUtilityPatentIndex 73
Photographing lens system, image capturing unit and electronic device

Assignee: LARGAN PRECISION CO LTDPriority: May 19, 2017Filed: Sep 21, 2017Granted: Jun 4, 2019
Est. expiryMay 19, 2037(~10.9 yrs left)· nominal 20-yr term from priority
Inventors:CHEN HUNG-SHUO HUANG HSIN-HSUAN
G02B 13/0045G02B 13/18G02B 9/60G02B 27/0025G02B 13/0015G02B 13/02
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References
Claims
Abstract

A photographing lens system includes five lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element has positive refractive power. The third lens element has an object-side surface being convex in a paraxial region thereof. The fourth lens element has an object-side surface being convex in a paraxial region thereof.
Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A photographing lens system comprising five lens elements, the five lens elements being, in order from an object side to an image side:
 a first lens element having positive refractive power; 
 a second lens element; 
 a third lens element having an object-side surface being convex in a paraxial region thereof; 
 a fourth lens element having an object-side surface being convex in a paraxial region thereof; and 
 a fifth lens element; 
 wherein a refractive power of the first lens element is P1, a refractive power of the second lens element is P2, a refractive power of the third lens element is P3, a refractive power of the fourth lens element is P4, a refractive power of the fifth lens element is P5, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, a central thickness of the second lens element is CT2, a central thickness of the fourth lens element is CT4, and the following conditions are satisfied:
   (| P 3|+| P 4|+| P 5|)/(| P 1|+| P 2|)&lt;0.60; 
   3.50&lt;| P 1|+| P 2|&lt;8.50; 
   0.20&lt;( T 34/ T 45)+( T 45/ CT 4)&lt;1.50; and 
   0.10&lt;( CT 2+ T 34)/ T 23&lt;9.0. 
 
 
     
     
       2. The photographing lens system of  claim 1 , wherein the second lens element has negative refractive power, and the second lens element has an object-side surface being concave in a paraxial region thereof. 
     
     
       3. The photographing lens system of  claim 1 , wherein a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, and the following condition is satisfied:
   0.10&lt; R 5/ R 6&lt;1.50. 
 
     
     
       4. The photographing lens system of  claim 1 , wherein a curvature radius of the object-side surface of the fourth lens element is R7, a curvature radius of an image-side surface of the fourth lens element is R8, and the following condition is satisfied:
   −0.45&lt;( R 7− R 8)/( R 7+ R 8)&lt;1.0.
 
 
     
     
       5. The photographing lens system of  claim 1 , wherein an Abbe number of the third lens element is V3, an Abbe number of the fifth lens element is V5, and the following condition is satisfied:
   20.0&lt; V 3+ V 5&lt;78.0. 
 
     
     
       6. The photographing lens system of  claim 1 , further comprising an aperture stop disposed between an imaged object and an object-side surface of the second lens element, wherein an axial distance between the aperture stop and an image-side surface of the fifth lens element is SD, an axial distance between an object-side surface of the first lens element and an image-side surface of the fifth lens element is TD, and the following condition is satisfied:
   0.75&lt; SD/TD&lt; 1.20. 
 
     
     
       7. The photographing lens system of  claim 1 , wherein an axial distance between the first lens element and the second lens element is T12, the central thickness of the fourth lens element is CT4, an axial distance between an object-side surface of the first lens element and an image surface is TL, a maximum image height of the photographing lens system is ImgH, and the following conditions are satisfied:
   0&lt; T 12/ CT 4&lt;0.50; and 
   2.50&lt; TL /Img H &lt;4.50. 
 
     
     
       8. The photographing lens system of  claim 1 , wherein a composite focal length of the first lens element and the second lens element is f12, a composite focal length of the third lens element, the fourth lens element and the fifth lens element is f345, and the following condition is satisfied:
   0&lt; f 345/ f 12&lt;1.80. 
 
     
     
       9. The photographing lens system of  claim 1 , wherein a focal length of the photographing lens system is f, a focal length of the first lens element is f1, an axial distance between an object-side surface of the first lens element and an image surface is TL, and the following conditions are satisfied:
   1.80&lt; f/f 1&lt;3.50; and 
   0.50&lt; TL/f&lt; 1.15. 
 
     
     
       10. The photographing lens system of  claim 1 , wherein a vertical distance between a critical point on an image-side surface of the fifth lens element and an optical axis is Yc52, the central thickness of the second lens element is CT2, and the following condition is satisfied:
   0.20&lt; Yc 52/ CT 2&lt;7.50. 
 
     
     
       11. The photographing lens system of  claim 1 , wherein each of at least three of the five lens elements has an Abbe number less than 45.0, half of a maximum field of view of the photographing lens system is HFOV, and the following condition is satisfied:
   0.15&lt;tan(HFOV)&lt;0.35. 
 
     
     
       12. The photographing lens system of  claim 1 , wherein a maximum effective radius of an object-side surface of the first lens element is Y11, a maximum effective radius of an image-side surface of the fifth lens element is Y52, and the following condition is satisfied:
   0.50&lt; Y 52/ Y 11&lt;1.10. 
 
     
     
       13. A photographing lens system comprising five lens elements, the five lens elements being, in order from an object side to an image side:
 a first lens element having positive refractive power; 
 a second lens element; 
 a third lens element having an object-side surface being convex in a paraxial region thereof; 
 a fourth lens element having an object-side surface being convex in a paraxial region thereof; and 
 a fifth lens element having an image-side surface being concave in a paraxial region thereof; 
 wherein at least one of the five lens elements has at least one inflection point, a refractive power of the first lens element is P1, a refractive power of the second lens element is P2, a refractive power of the third lens element is P3, a refractive power of the fourth lens element is P4, a refractive power of the fifth lens element is P5, a central thickness of the second lens element is CT2, a central thickness of the fourth lens element is CT4, and the following conditions are satisfied:
   (| P 3|+| P 4|+| P 5|)/(| P 1|+| P 2|)&lt;0.80; 
   3.50&lt;| P 1|+| P 2|&lt;8.50; and 
   0.03&lt; CT 2/ CT 4&lt;0.58. 
 
 
     
     
       14. The photographing lens system of  claim 13 , wherein there is an air gap in a paraxial region between each of the five adjacent lens elements of the photographing lens system, and the fourth lens element has an image-side surface being concave in a paraxial region thereof. 
     
     
       15. The photographing lens system of  claim 13 , wherein the third lens element has positive refractive power, and the third lens element has an image-side surface being concave in a paraxial region thereof. 
     
     
       16. The photographing lens system of  claim 13 , wherein the fourth lens element has positive refractive power, an axial distance between an object-side surface of the first lens element and an image surface is TL, a focal length of the photographing lens system is f, and the following condition is satisfied:
   0.50&lt; TL/f&lt; 1.15. 
 
     
     
       17. The photographing lens system of  claim 13 , wherein an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, and the following condition is satisfied:
     T 12/ T 23&lt;0.70. 
 
     
     
       18. The photographing lens system of  claim 13 , wherein a maximum effective radius of an object-side surface of the first lens element is Y11, a maximum effective radius of the image-side surface of the fifth lens element is Y52, and the following condition is satisfied:
   0.50&lt; Y 52/ Y 11&lt;1.10. 
 
     
     
       19. The photographing lens system of  claim 13 , wherein the refractive power of the first lens element is P1, the refractive power of the second lens element is P2, an axial distance between the fourth lens element and the fifth lens element is T45, an axial distance between the image-side surface of the fifth lens element and an image surface is BL, and the following conditions are satisfied:
   4.0&lt;| P 1|+| P 2|&lt;7.50; and 
   0.10&lt; T 45/ BL&lt; 1.0. 
 
     
     
       20. The photographing lens system of  claim 13 , wherein the central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, the central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, half of a maximum field of view of the photographing lens system is HFOV, and the following conditions are satisfied:
   1.0&lt;( CT 3+ CT 4)/( CT 2+ CT 5)&lt;8.0; and 
   0.15&lt;tan(HFOV)&lt;0.35. 
 
     
     
       21. The photographing lens system of  claim 13 , wherein each of at least three of the five lens elements has an Abbe number less than 45.0. 
     
     
       22. The photographing lens system of  claim 13 , wherein a vertical distance between a critical point on the image-side surface of the fifth lens element and an optical axis is Yc52, the central thickness of the second lens element is CT2, and the following condition is satisfied:
   0.20&lt; Yc 52/ CT 2&lt;7.50. 
 
     
     
       23. The photographing lens system of  claim 13 , wherein an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, and the following condition is satisfied:
     T 34/ T 23&lt;0.30. 
 
     
     
       24. An image capturing unit, comprising:
 the photographing lens system of  claim 13 ; 
 a prism disposed on the photographing lens system; 
 a driving device disposed on the photographing lens system; and 
 an image sensor disposed on an image surface of the photographing lens system. 
 
     
     
       25. An electronic device, comprising:
 the image capturing unit of  claim 24 . 
 
     
     
       26. A photographing lens system comprising five lens elements, the five lens elements being, in order from an object side to an image side:
 a first lens element having positive refractive power; 
 a second lens element; 
 a third lens element having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof; 
 a fourth lens element having positive refractive power; and 
 a fifth lens element; 
 wherein at least one of the five lens elements has at least one inflection point, a maximum effective radius of an object-side surface of the first lens element is Y11, a maximum effective radius of an image-side surface of the fifth lens element is Y52, a refractive power of the first lens element is P1, a refractive power of the second lens element is P2, a refractive power of the third lens element is P3, a refractive power of the fourth lens element is P4, a refractive power of the fifth lens element is P5, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, and the following conditions are satisfied:
   0.50&lt; Y 52/ Y 11&lt;1.10; 
   (| P 3|+| P 4|+| P 5|)/(| P 1|+| P 2|)&lt;0.60; and 
   1.80&lt;( CT 3+ CT 4)/( CT 2+ CT 5)&lt;7.0. 
 
 
     
     
       27. The photographing lens system of  claim 26 , wherein the second lens element has an object-side surface being concave in a paraxial region thereof, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, and the following condition is satisfied:
     T 34/ T 23&lt;1.0. 
 
     
     
       28. The photographing lens system of  claim 26 , wherein an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, the central thickness of the fourth lens element is CT4, and the following condition is satisfied:
   0.20&lt;( T 34/ T 45)+( T 45/ CT 4)&lt;1.5. 
 
     
     
       29. The photographing lens system of  claim 26 , wherein half of a maximum field of view of the photographing lens system is HFOV, an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the photographing lens system is ImgH, and the following conditions are satisfied:
   0.15&lt;tan(HFOV)&lt;0.35; and 
   2.50 &lt;TL /Img H &lt;4.50. 
 
     
     
       30. The photographing lens system of  claim 26 , wherein each of at least three of the five lens elements has an Abbe number less than 45.0.
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